Alternative notice of appeal by defendants retained 12 June 1996. Alternative petition by defendants for discretionary review pursuant to G.S. 7A-31 allowed 12 June 1996. Petition by plaintiffs for discretionary review pursuant to G.S. 7A-31 allowed 12 June 1996. Petition by plaintiff intervenors (Ingram, et al) for discretionary review pursuant to G.S. 7A-31 allowed 12 June 1996.